Summary: Now you can use your MP3 to listen to your favorite tunes through any FM stereo receiver. Coolong FM Transmitter wirelessly connects portable music players to your car or home stereo quickly and easily. Just plug the FM Transmitter into the headphone jack of your MP3 or any audio source including your PDA, CD, or cassette player; or connect it to your PC or laptop computer. Tune your car stereo or receiver to the clearest FM frequency, and enjoy your digital music with full sound conveniently. Audio transmitter: You do not need change any part of your car, but just plus this units, it can transmit the music from Mp3 to your car FM receiver Temperature measure: Digital temperature measure at your car or home Build in Microphone:(This function just only for the coolong plus version) Security listening Take Care of baby Application: 1. Auto car FM system, that can play MP3, CD, PDA, Person Computer, CAR-TV, CAR navigation and etc. 2. Home wireless music system, that can reduce the difficulty to layout the wire or for any place that local in different place 3. Security listening 4. Baby looking Feather: 1. Rohm chip BH1418F inside 2. Wide Frequency band:88~108MHz,0.1MHz step, more than 200 channels to be used,covered japanese frequecy and any lower frequency countries 3. Digital temperature measure at your car or home 4. Large digital LCD display panel 5. Favorite channel setting, we can store 3 channels we like and which could be loaded quickly any time 6. Stable voice and low noise 7. Build in Microphone 8. Dual power supply, Battery or DC adapter 5V power supply, 9. low power consumption 10. Build-in low current charge circuit, rechargeable battery can be used conveniently. 11. Hi-Fi,stereo music models 12. Beautiful outline and super value enjoy